🐾 Pet Health Tool
🐶 Puppy Weight Calculator
Predict your puppy’s adult weight and size category based on breed, current weight, and age.
Puppy Details
Select a Breed Optional
Breed hint helps refine the size category estimate.
Puppy’s current weight Required
kg
Birth date Auto-calculates age
Age in weeks is auto-calculated from this date.
Age in weeks Auto-filled or enter manually
weeks
Gender
🐶 Puppy Weight Report
Generated:
Puppy’s Age
—
weeks old
Current Weight
—
kg
Predicted Adult Weight
—
kg
Range: —
—
Adult Weight
pounds (lb)
—
Adult Weight
kilograms (kg)
—
Adult Weight
ounces (oz)
🐕
Medium Dog
22–57 lb / 10–25.9 kg
e.g. Labrador, Samoyed, Border Collie
📏
Predicted Maximum Height (Paw to Shoulder)
Up to 25 in (63.5 cm)
Formula Used
Adult Weight = (Puppy Weight ÷ Age in Weeks) × 52
Did we solve your problem today? 🐾
🐶 How Much Will My Dog Weigh?
Our puppy weight calculator uses a proven formula to predict your dog’s adult weight:
Adult Weight = (Puppy Weight ÷ Age in Weeks) × 52
This estimates your puppy’s weight at 1 year of age.
Why 52?
52 is the number of weeks in a year. Dogs typically mature within 12 months — 8 months for small breeds, 16+ months for giants like Great Danes.
Dog Size Categories
🐩Toy<12 lb / <5.4 kg
🐕Small12–22 lb
🐕🦺Medium22–57 lb
🦮Large57–99 lb
🐻Giant>99 lb
💡
Did you know? For every 4.4 lb (2 kg) increase in adult weight, a dog’s lifespan decreases by ~1 month!
Height Estimates
- Toy: Max 12 in (30.5 cm)
- Small: Max 18 in (45.7 cm)
- Medium: Max 25 in (63.5 cm)
- Large: Max 30 in (76.2 cm)
- Giant: Max 44 in (111.8 cm)
🏆
The tallest dog ever was a Great Dane named Zeus — 44 inches (111.8 cm) tall!
Growth-Influencing Factors
- Parents: Puppies rarely exceed their largest parent’s size.
- Gender: Males are typically larger, especially in big breeds.
- Nutrition: Balanced diet is essential — over or underfeeding affects growth.
- Health: Illness, parasites, or injury can interrupt development.
- Exercise: Age-appropriate activity builds strong bones and muscles.
FAQ
How big will a 9 lb puppy at 12 weeks get?
Around 39 lbs (range 35–43 lbs). Formula: (9 ÷ 12) × 52 = 39 lbs. Height up to 25 in.
How do I calculate my dog’s adult size?
Use: Adult Weight = (Current Weight ÷ Age in Weeks) × 52. Or use the calculator above!
How big is a 30 lb dog?
A medium-sized dog, up to 25 in tall. Examples: Samoyed, Labrador Retriever, American Staffordshire Terrier.
At what age is a puppy fully grown?
On average 12 months. Small breeds: 8–10 months. Giant breeds: 18–24 months.